Calculating Work Done by a Varying Force: Positive or Negative?

[williams31]

An object of mass 2 kg is repelled from the origin by a force in the +x-direction whose magnitude varies with x according to F=(7Nxm^2)x^-2. How much work is done by this force when the object moves from x=2 to x=3? (Be sure to say whether this work is positive or negative.)


I have no idea how to start this problem off. Anybody want to help me out?

 

[berkeman]

What is the equation that defines how much work is done, in terms of the force and distance through which the force acts? Work is the integral of what quantities?

 

[Hootenanny]

You really should look through the link I gave you on the other thread.